7 How to solve $\omega^4-[(\frac{eB}{m})^2+2\omega_0^2]\omega^2+\omega_0^4=0$ in the simplest way 5 What is wrong with this bijection from all naturals to reals between 0 and 1? 4 Given only the lengths of the three sides of a triangle, can we find if the triangle is impossible? 4 Find the determinant of matrix $A$ 3 How many roads does this country have?

### Reputation (1,367)

 +8 Is there a simple rule defining the sequence $\frac 1 2, 1, -\frac 1 2, -1, \frac 1 4, \frac 1 2, \dots$? +85 How to solve $\omega^4-[(\frac{eB}{m})^2+2\omega_0^2]\omega^2+\omega_0^4=0$ in the simplest way +10 How many roads does this country have? +10 In a triangle with $\overline{AB}=62$ , $\overline{AC}=50$ and $\overline{BC}=105$, find the lenght of the segment $\overline{Q_1Q_2}$

### Questions (16)

 12 What is the reason for the term “zero dimensional” in the context of topology? 8 Can the definition of “The Long Line” be clarified? 5 Which Smirnov is behind the Smirnov topology? 4 What is the significance of the term “separable” in the context of countability properties? 3 What is the reason for an “irreducible” (topological) space to be so called?

### Tags (64)

 11 calculus × 3 7 arithmetic 7 discrete-mathematics × 6 6 matrices × 3 7 real-numbers × 2 6 linear-algebra × 2 7 quadratics 5 modular-arithmetic × 4 7 radicals 5 trigonometry × 4

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